TC 9-64 _________________________________________________________________________
1-117. An antenna is a conductor or a set of conductors used either to
radiate electromagnetic energy into space or to collect this energy from space.
Figure 1-24 shows an antenna. View A is a drawing of an actual antenna;
view B is a cut-away view of the antenna; and view C is a simplified diagram
of the antenna.
Figure 1-24. Antenna
COMPONENTS OF THE ELECTROMAGNETIC WAVE
1-118. An electromagnetic wave consists of two primary components--an
electric field and a magnetic field. The electric field results from the force of
voltage, and the magnetic field results from the flow of current.
1-119. Although electromagnetic fields that are radiated are commonly
considered to be waves, under certain circumstances their behavior makes
them appear to have some of the properties of particles. In general, however,
it is easier to picture electromagnetic radiation in space as horizontal and
vertical lines of force oriented at right angles to each other. These lines of
force are made up of an electric field (E) and a magnetic field (H), which
together make up the electromagnetic field in space.
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